Java Programs

/**Collect no’s  from  list1 which is not present in list2 & Collect no’s  from  list2 which is not present in list1 and store
 * input1={1,2,3,4};
 * input2={1,2,3,5};
 * int[] output={4,5};
 */

package programs;

import java.util.ArrayList;
import java.util.List;

public class ListDifferenceToIntArray {
public static void main(String args[]) {
List<Integer> a = new ArrayList<Integer>();
a.add(1);
a.add(2);
a.add(3);
a.add(4);

List<Integer> b = new ArrayList<Integer>();
b.add(1);
b.add(2);
b.add(3);
b.add(5);

List<Integer> c = new ArrayList<Integer>(a);
List<Integer> d = new ArrayList<Integer>(b);

// A-B
c.removeAll(b);
System.out.println(c);

// B-A
d.removeAll(a);
System.out.println(d);

// C+D
c.addAll(d);

Integer[] output = new Integer[c.size()];
c.toArray(output);
// Wrapper classes should be used when converting from collections

System.out.println("Array Elements are : ");
for (int i = 0; i < output.length; i++) {
System.out.println(output[i]);
}
}
}